Airbag control unit with part number 222814-101

What is the function of Airbag Control Unit 222814-101?

The airbag control unit with part number 222814-101 is the central control module of the occupant safety system (SRS) in Toyota Auris E180 models. It processes data from acceleration and crash sensors in real time to precisely and rapidly deploy airbags and seatbelt pretensioners in the event of a collision.

As a standard SRS control unit, it is responsible for monitoring all safety‑related components of the restraint system, including front, side, and head airbags, seatbelt pretensioners, seatbelt buckle detection, as well as associated sensors and the seat occupancy mat.

Under normal operating conditions, the unit continuously communicates with other vehicle systems and performs self‑diagnostics. Any detected fault, even an internal defect, immediately triggers the airbag warning light to alert the driver that the system is not functioning properly.

Why does control unit 222814-101 fail?

The most common cause of failure for control unit 222814-101 is the storage of crash data after a collision. Additional defects arise from internal electronic issues, such as aging components or faulty solder joints. A thorough vehicle diagnosis is essential to rule out external sources of malfunction.

Following a crash—even if not all airbags deployed—the control unit permanently stores indeletable crash records in its internal EEPROM memory. The unit then locks itself and enters a safety mode to prevent incorrect reactivation. This lock cannot be cleared through standard OBD diagnostics.

Furthermore, internal hardware faults may occur, including defective memory chips, voltage regulators, driver ICs, or cold solder joints caused by vibration and thermal stress. Such defects often result in communication failures or persistent internal error codes.

It is imperative to perform a complete vehicle diagnosis before removing the control unit. Faults in sensors, wiring, or seat occupancy mats can produce similar symptoms, even when the control unit itself remains intact. These fault patterns resemble those found in related Toyota control units, such as 89170‑02100 or 89170‑0W330.

How do you recognize a defect in Airbag Control Unit 222814-101?

A defective control unit 222814-101 primarily manifests as a constantly illuminated or flashing airbag/SRS warning light on the instrument cluster. Often, communication with the control unit via a diagnostic tool is impossible, or persistent error codes remain unerasable.

The clearest indication is the continuously lit airbag warning light, signaling a serious system malfunction. In this state, the entire airbag system is disabled, posing a significant safety risk in the event of a crash and resulting in failure during the mandatory technical inspection (HU).

Another common symptom is complete loss of communication: the workshop can no longer access the control unit through the OBD interface to read or clear errors.

After a collision, specific error codes are stored in memory, indicating recorded crash data. Additionally, errors such as “internal control unit fault” or abnormal sensor readings (e.g., “resistance too high/too low”), which persist despite checking external components, point to a defect within the control unit itself.

In which vehicles is control unit 222814-101 installed?

Airbag Control Unit 222814-101 is specifically designed for the second generation of the Toyota Auris. At Airbag24, we professionally refurbish this control unit for both pre‑facelift and facelift models of this series, restoring full functionality to the safety system.

At Airbag24, we repair part number 222814-101 for the following models:

Toyota Auris (E180) (2012–2015)

Toyota Auris (E180 Facelift) (2015–2019)

How does the repair process for control unit 222814-101 work?

The repair process at Airbag24 includes professional diagnostics, electronic component‑level restoration, and a final functional test. After careful removal at your workshop, the unit is shipped to us for repair and returned ready for installation. You receive 2 years' statutory liability for defects on the repair.

First, your workshop conducts a precise vehicle diagnosis to rule out external causes of malfunction. Following removal, the control unit is securely packaged and sent to Airbag24 along with the diagnostic report.

Upon receipt, an initial inspection is performed on a specialized test bench. Technicians directly read the internal error memory and crash data from the memory chip.

The actual electronic repair, depending on the fault pattern, involves either selectively erasing the crash data from the EEPROM or replacing defective SMD components such as memory chips, voltage regulators, or driver ICs. Re-soldering cold joints is also part of the standard procedure.

Subsequently, the refurbished control unit undergoes a comprehensive functional test. Upon successful verification, it is returned and can be reinstalled without further coding (plug & play). Finally, the vehicle’s fault memory must be cleared at the workshop.